Bradley is standing on the top of a mountain holding a soccer ball. which of these best describes what happens when he throws the ball over the edge?

a)
the kinetic energy increases and so does the total amount of energy.

b)
the kinetic energy decreases and the total amount of energy increases.

c)
the potential energy decreases and the total amount of energy also decreases.

d)
both the kinetic and potential energy change, but the total energy remains constant.

good for her? ? where is the question?

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia